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QUICK REVIEW… Layers of the
EarthCrust (2 types)MantleOuter CoreInner Core
Earth’s crust and the very top of the mantle form the lithosphere
Lithosphere sits on top of the asthenosphere
WHAT DO WE MEAN WHEN WE SAY
“EARTH’S HISTORY?”Study Jams Slide Show: How did all of these
things happen?
http://studyjams.scholastic.com/studyjams/jams/science/rocks-minerals-landforms/landforms.htm
HOW???
LAW OF UNIFORMITARIANISMLaw of
Uniformitarianism- the idea that Earth is an always changing place
The same forces of change are at work today that were at work in the past.
Some changes are gradual; some changes are fast.
T-CHART: SLOW CHANGES VS.
FAST CHANGES
SOME THINGS HAPPEN SLOWLY, WHILE OTHERS HAPPEN QUICKLY, BUT WHAT THEY BOTH HAVE IN COMMON IS THAT IT IS MOVEMENT THAT CAUSES THESE CHANGES…BUT MOVEMENT OF
WHAT????
HINT:
TECTONIC PLATES The Lithosphere broken into many large and small
slabs of rock called tectonic plates and where two plates meet, a lot of changes can occur.
They move because of convection currents.
The hot, soft rock in the mantle rises…then it cools, and sinks.
TECTONIC PLATES
How do the
tectonic
plates move?
1. Divergent2. Convergent 3. Transform
TECTONIC PLATES
There are 3 types of
plate boundaries
Please TURN to back of paper
Key word: Divide
DIVERGENT
DIVERGENT
What occurs at this boundary?
New Crust Forms
Mid-ocean ridges
Rift valleysEarthquakes
Volcanoes
DIVERGENT
Key word: Collide
3 types of convergent:Continental-continental
Oceanic-oceanicOceanic- continental
CONVERGENT
CONVERGENT: CONTINENTAL-CONTINENTAL
What occurs at this boundary?
High mountains
Earthquakes
CONVERGENT: CONTINENTAL-CONTINENTAL
CONVERGENT: OCEANIC-OCEANIC
What occurs at this boundary?
Deep-ocean trenches
Volcanic islands
Earthquakes
CONVERGENT: OCEANIC-OCEANIC
CONVERGENT: OCEANIC- CONTINENTAL
What occurs at this boundary?
Deep-ocean trenches
Coastal mountains
Earthquakes
CONVERGENT: OCEANIC- CONTINENTAL
Key word: Slide
TRANSFORM
TRANSFORM
What occurs at this boundary?
FaultsEarthquakes
TRANSFORM
When one plate sinks under another plate
CAN ONLY HAPPEN…Continental & oceanic
plate collide = oceanic plate ALWAYS sinks because it is more DENSE.
Oceanic & oceanic plate collide = the older more dense plate sinks!
BUT WHAT ABOUT SUBDUCTION?
What is Subduction
?
http://www.sepuplhs.org/middle/iaes/students/simulations/SEPUP_Plate_simulation.swf
PLATE MOTION SIMULATION
HOMEWORKFind a real world example for
each type of boundary to fill in the last column of the chart…you may also include a printed picture
Vocabulary Set 1 – Day 1
